2420 injection pump ?

[bobfor]

Hello all,new member to the forum and Chinese tractors (or tractors and diesels for that matter). I have a 2004 2420 farm pro and it recently just stalled while bush hogging,after some research it seems its the injector pump. Just curious

1. What is the power steering looking pump thing,in front of the injector (looks like the cap is a breather?)
Also Ive read on a few forums that the plunger can stick and cause this but where on the pump would I go to get access to that? Ive been told by a dealer that it would be behind a plate thats behind the pump,but mine doesn't have the plate there.

2. Also looking at injector pumps online it seems there are different models and my doesn't really look like the ones Ive seen. Also on my manual it says TY290X is there a 290 and a 290 x model? thanks in advance Bob

 

[Bob Rooks]

Welcome Bob. :applause: :welcome: :applause:

 

[Rich Waugh]

Bob,

I'd suggest you call the folks at Affordable Tractor Sales in Texas and ask them about your issues. They're extremely knowledgeable and helpful, and they'll have any parts you may need. I wouldn't jump to any conclusions about the injector pump right off the bat, either. I don't hear of all that many failures of injector pumps, at least not compared to the injectors themselves, bad fuel, dirty fuel systems, etc. Always look for the cheapest possible problem - it's more likely than an expensive injector pump.

 

[bobfor]

Bob,

I'd suggest you call the folks at Affordable Tractor Sales in Texas and ask them about your issues. They're extremely knowledgeable and helpful, and they'll have any parts you may need. I wouldn't jump to any conclusions about the injector pump right off the bat, either. I don't hear of all that many failures of injector pumps, at least not compared to the injectors themselves, bad fuel, dirty fuel systems, etc. Always look for the cheapest possible problem - it's more likely than an expensive injector pump.

Rich thanks for the response, well I have did the basic trouble shooting that was recommended. Ive changed the fuel filter,changed the injector oil,and Iam getting fuel to the pump,but when I remove the hardlines and crank it over nothing coming out of those and from the research Ive done,that appears to be injector related. Also heard that sometimes the plunger sticks,but a couple parts dealers said the access to that is behind the primer pump but its not on mine. That's why Iam curious if the 290 and 290x are different? Bob

 

[greg_g]

Hard telling, the Chinese often change mechanicals without changing the manuals. Regardless, your tractor is a rebadged Jinma (JM204). Assuming you want manuals for the 2420, make sure to mention the X when ordering from a Jinma dealer. There are two for the engine, two for the tractor itself.

This piston things to which you refer are typically on top of the pump, not in the rear. Viewing them means removing the top plate. But try this simple test first. The hard lines are fastened to the injectors with hex collars. Loosen both collars about one turn, then crank the engine. If you see fuel dribbling down both, your pump is good. One wet and one dry suggests a stuck "piston. No dribbling means a non-functioning pump.

Sounds like that's about where you stopped. A stripped drive tang (or socket) is usually at fault. Both being dry could indicate both "pistons" stuck simultaneously, but that's more typical of pumps that have sat idle for prolonged periods. Before tearing into the pump itself, I recommend pulling the pump from the drive housing. Look at the exposed end of the pump and at the exposed drive gear. You should see a square drive tang on the pump, and a square socket in the drive gear. If you see a broken tang on the pump - or a stripped socket in the drive - that's your culprit. If both tang and socket appear functional, only then should you consider tearing into the pump itself.

//greg//

 

[bobfor]

Greg thanks for the reply. Well I did completely remove both hard lines from the injectors the other day and turned it over,I guess a fully functioning pump would of shot fuel out very strong? What I got was no fuel from the first line (by the radiator) and a slight dribble from the second line (by the firewall). So by removing the pump from the drive housing you mean completely removing it? Theres no way to check the plunger/piston with the pump still attached to the motor? Sorry for the newb questions,but the most Ive ever done with a diesel is fill the tank a couple times LOL,thanks again Bob

 

[greg_g]

No, the word "dribbling" was used intentionally. And yes, you can view them without removing the pump. But you want to make sure first that the pump drive is functioning normally. If the tang is slipping in the socket, the pump won't be turning at the correct speed. That can produce erratic flow through the hard lines. And in the event of insufficient pressure in those lines, the injectors may not pop. When they don't pop, no fuel is delivered to the cylinder. My recommendation is to disconnect the hardlines at the bottom, so they don't present resistance. Then remove the pump itself from the drive housing. If the tang and socket are undamaged, only then would I remove the top of the pump. I say this simply to minimize the possibly of otherwise unnecessary gasket damage and/or contamination.

That said, the fuel delivery system operates with critical tolerances. Unqualified tinkering can result in expensive repairs/replacements. Given your stated level of experience, you might want to consider handing this specific issue over to a certified diesel mechanic.

//greg//

 

[bobfor]

Unfortunately a mechanic isn't in the cards right now, also I have turned my share of wrenches just never on a diesel. Plus Iam kinda a DIY guy and I figure Iam gonna keep this little tractor for a while so I might as well learn about it? I will have some fun with it in a little bit, also I figure if my pump is bad or something in it,it wont really hurt?

 

[Bob Rooks]

A little "dribble" from an individual pump is acceptable because the pumps only deliver so many cc's of fuel per stroke. From your description it sounds like you only have one functioning barrel and plunger assembly out of all three. It is also possible that you have a stuck rack. Your symptoms are synonymous with corroded components caused by diesel bugs. The DIESEL FUEL BUG . If this is indeed the case then you have probably gone as far as you can go save for R & R the injection pump and governor assembly and take it to a diesel shop for cleaning and calibration.

 

[bobfor]

Bob thanks for the input,but from what Ive read it cost twice as much to rebuild these as it does to buy as new one. And that's if you could even find someone to rebuild it? Also if it is a stuck plunger from small debris,etc cant just that be taken apart ,cleaned and reassembled?